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Efficient deep-ultraviolet generation by frequency doubling in beta-BaB(2)O(4) crystals.

K Miyazaki, H Sakai, T Sato

    Optics Letters
    |September 10, 2009
    PubMed
    Summary

    Researchers achieved efficient ultraviolet light generation using beta-BaB(2)O(4) crystals. This method offers tunable coherent ultraviolet output with high second-harmonic generation efficiency.

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    Area of Science:

    • Nonlinear Optics
    • Solid-State Physics
    • Laser Technology

    Background:

    • Efficient generation of coherent ultraviolet (UV) light is crucial for various scientific and technological applications.
    • Beta-barium borate (beta-BaB(2)O(4)) crystals are known nonlinear optical materials.
    • Previous studies explored UV generation but often faced limitations in efficiency or tunability.

    Purpose of the Study:

    • To investigate efficient and tunable coherent ultraviolet generation in beta-BaB(2)O(4) crystals.
    • To determine the second-harmonic (SH) generation efficiency across the 205-310 nm range.
    • To compare the performance with existing materials like ammonium dihydrogen phosphate.

    Main Methods:

    • Utilized Type I phase matching technique for second-harmonic generation.

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  • Employed beta-BaB(2)O(4) crystals at room temperature.
  • Investigated tunable coherent ultraviolet generation using a fundamental dye laser.

    • Main Results:

    • Achieved a second-harmonic (SH) generation efficiency (eta) exceeding 10% at a SH wavelength (lambda(SH)) of approximately 206 nm.
    • Obtained a maximum SH generation efficiency of 36% with a fundamental dye-laser power of 150 kW.
    • Demonstrated that eta at lambda(SH) = 310 nm was 4-6 times greater than that in ammonium dihydrogen phosphate.

    Conclusions:

    • Beta-BaB(2)O(4) crystals enable efficient and tunable coherent ultraviolet generation.
    • The demonstrated SH generation efficiency is significant, particularly at shorter UV wavelengths.
    • Beta-BaB(2)O(4) offers superior performance compared to ammonium dihydrogen phosphate for specific UV generation applications.